Fraction Calculator

Type fractions like 3/4, mixed numbers like 1 1/2, whole numbers or decimals.

Answer
Working:

How to add and subtract fractions

  1. Find a common denominator (the least common multiple of the two denominators).
  2. Rewrite each fraction with that denominator.
  3. Add or subtract the numerators and keep the denominator.
  4. Simplify by dividing top and bottom by their greatest common factor.

Example: 1/4 + 2/3 → common denominator 12 → 3/12 + 8/12 = 11/12.

How to multiply fractions

Multiply the numerators together and the denominators together, then simplify: 2/3 × 3/4 = 6/12 = 1/2.

How to divide fractions

Flip the second fraction (take its reciprocal) and multiply: 3/4 ÷ 1/2 = 3/4 × 2/1 = 6/4 = 1 1/2.

Mixed numbers

To use a mixed number such as 2 1/3, turn it into an improper fraction first: 2 × 3 + 1 = 7, so 2 1/3 = 7/3. The calculator does this automatically — just type the whole number, a space, and the fraction.

Frequently asked questions

How do I enter a mixed number?

Type the whole number, a space, then the fraction — for example 3 1/4.

Can I use negative fractions?

Yes. Type a minus sign in front, like -2/5 or -1 1/2.

Does the calculator simplify the answer?

Yes. Answers are always reduced to lowest terms and also shown as a mixed number and a decimal.

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